/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/DynamicAttribute.h
Stores the given attribute pointer in the attribute register, so that it will be updated with mesh changes, but does not take ownership of the attribute memory.
void RegisterExternalAttribute ( [TDynamicAttributeBase](API\Runtime\GeometryCore\DynamicMesh\TDynamicAttributeBase)< ParentType > * Attribute )